Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bd21fa47847ef15135bad71e397445682dbeddc1818398316a17f505f38067' 
  AND token = 'rRZ85aAiMFcFE7vrBxdSoT6LypbqMrJUSApZiXldyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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