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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444a80784925568f849f8e19aac7adce38a87a3d241da0daf57bbcfe887b40bc' 
  AND token = '6+8dkXBZBQdySsp1E8CWW+Fp05s8AF9LuMbSayWPSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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