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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824137b3a49d2a6b5e096ef29cd6a701050e3961a6b16467bb7ba7756bfa3c68' 
  AND token = 'qXc8vH9lyJ/NopGQo+nkWqTcw3eViCSpF0cMS8mLuq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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