Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2350cf7de914ac8149920ff5c3acd1fe2dbad0c6f8301095453feac716168de1' 
  AND token = 'FXM3QRdcKurklW9c+JXU4h4f8I1b23GLrdlqhUQ958U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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