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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5449833f2318663c35688c0d66987ea5478918e1cc4c8ed4e612428270dd00a3' 
  AND token = 'm0WZwLI/uFVKj4tHUWw6Z2fJqmi1s77ZXzAM/s7bgmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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