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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81a2fb690f776883b1ab8f6306e54a90ebd10390789401197e860e69c0df106' 
  AND token = 'qQgMSQE+klskRkBC6zEtHzoke0u0yQ0ku07jT/66cf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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