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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c312275e2e3444e5292c22e398f959e9e12a947ea53b5f1fb3f7cb6e53fba7f3' 
  AND token = 'J0RxmArEE2S+69RO2Xi/Zx31UFztndqvqQHMJvmVagg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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