diff --git a/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/analysis/resolver/BooleanConstraintEvaluator.java b/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/analysis/resolver/BooleanConstraintEvaluator.java
index cd306b1..b578751 100644
--- a/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/analysis/resolver/BooleanConstraintEvaluator.java
+++ b/state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/analysis/resolver/BooleanConstraintEvaluator.java
@@ -59,6 +59,7 @@ public final class BooleanConstraintEvaluator {
         try {
             return parseExpression(expression.replaceAll("\\s+", ""));
         } catch (Exception e) {
+            // Be conservative in pruning: if we can't parse the expression, do not discard paths.
             return !expression.contains("false");
         }
     }
@@ -108,6 +109,12 @@ public final class BooleanConstraintEvaluator {
         if (boundValue.contains(".") && Character.isUpperCase(boundValue.charAt(boundValue.lastIndexOf('.') + 1))) {
             return true;
         }
+        // Treat simple routing keys (e.g. order.pay) as concrete string bindings, but avoid
+        // mistaking variable names (e.g. machineType) for concrete values.
+        if ((boundValue.contains(".") || boundValue.contains("/") || boundValue.contains("-"))
+                && boundValue.matches("^[a-zA-Z0-9._/-]+$")) {
+            return true;
+        }
         return boundValue.equals(boundValue.toUpperCase(Locale.ROOT)) && boundValue.chars().allMatch(ch ->
                 Character.isUpperCase(ch) || ch == '_');
     }