SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac5368b40c77851ce0ee5279ed9b9b4a892929bd6acea8619327f9ff13eb55e' 
  AND token = 'oaLKX/YsQyeQMP8xYGMHB/WLFVDwihoa6mOP+BUD/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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