SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bed442a71086a79ca0d51aa4b6c89f9bc9fd96157d81b78c52312e028a41d84' 
  AND token = 'XZKyGWjYFascMqlqAHUAXvVjLyRiKSsH/jxUBIrt+kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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