SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be6eaa0a187a889f5ba31cde870f032b69f055e421d1c5e24adc7907939be77' 
  AND token = 'anZXrhVF8HJdWgMxsFLS+wHbRB3ucQIOA3vqKT0rX+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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