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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0215a75911956fc697c9f2f48b85501623db28ff9e80972df537b46c1d6992e3' 
  AND token = '/+IocYJGFkG7vLed9xVrBT0iFrSRH1aE9F0R0YW9rzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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