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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691784b9eededf906a6091dd75a2106bef8d5b8fed78b666b61784f0766b03d7' 
  AND token = 'TeSmhQjsNiBavF1FKeogim8KowZY1MlLuPcRO6DC/Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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