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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168948bee5eb16532d3800249a8a06ad911fd2028a49f970a072aeb4f6161c60' 
  AND token = 'WxZBVJRRrFuAcMoluLJmyqRQ7/P/xqMSj3V7X8cef4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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