Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83982c1ad9d3efb35aed7effafd185b9a484c08baae966117e45dd68f8ce16e3' 
  AND token = '7QFmPlhBkxOMycOFg+wJIR0killKx3L1GATxaS5ElrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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