SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9f7efbbc27e80d59ba22200cf9f34198b147ba195d36aabaf24630c88efd99' 
  AND token = 'KrzvOXQbls/SqoX13zgNGgs05og0fvAwnCYLkyOVqAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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