SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd770d43f5bcff60c12fd9b26ad289289891951ad6076345a5a755017117a64' 
  AND token = 'FtqeLAxBuYU25HZOkpYX8Yc23rVCl0y5vA9TZWOjQSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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