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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ba741cef5fc45daa0232a44e64a9d55845535957ea938ad3a96a001c2b88a9' 
  AND token = 'ukoKmqC2Xm2dvfTvTwfl5iAS4d3HdCf9yWSoSWqPkwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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