EXPLAIN

Explain query execution

Prefix any query with the EXPLAIN keyword to have Neo4j return the execution plan it would use to execute the query. However, the query is not executed, and Neo4j will make no changes to the database.

See :help QUERY PLAN for a guide to understanding the query plan output.

Reference: Execution Plans manual page
Related: :help PROFILE :help QUERY PLAN 
EXPLAIN
MATCH (n:Person) RETURN n LIMIT 25
Show the query plan that would be used to find nodes with the Person label, without actually executing the plan.