Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc9691c482621e8d7570988fdc63898826bddc5350bb25aed37dcf5a6c90a71' 
  AND token = '0k5LYob87X0MnpEYdRbb5pHJW7b1V89fFUCtZrl27E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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