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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9ace467003244a74dac533fe3386915cc8af18d1cdd9c411e5d514860648c9' 
  AND token = 'a9tv8MK6mwjpst996BZgeRO6FjBvmtEfWXVpjvEk8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}