Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d91e134321d95b49a3a475d4c99652aa12b4dbd962900487fdbea4fd4ffad7a' 
  AND token = 'yxYNelCQvFoGxBuNoTiwAgFRsvyrCQEMiSXI2RGIe2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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