Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ee7347dcb36d0c107e5401611e5c423eb372f42c0846364105568787399032' 
  AND token = 'O2BUAtb7o6p094n7BagcHfSVEyGUnIzsxtMxHYRqp84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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