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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e1909f455056abcd17bb57c0d6247ab9d53eefa35d3fef252f76b7f01acda5' 
  AND token = 'vk9G7exDgiEZtvXHwiwGuefNJ9ls7cUh4lkMmMZ/rtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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