SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0de3b4748d15321ae9c4eae00727a14f78ef5b2a417951b3f84fd3c723db54' 
  AND token = 'sA+XJ9za7ml+tLJjdRBhg6LDZoHnyd+NyZKBlz6kONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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