SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3615a5c79285d8042a8e124d03cf52f7ab07b742fabead18bfd25cd70832f6' 
  AND token = '9rqrW7j45fzXvDQRy7/kqLOg4kfi+ZTQQuTTUFJaGjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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