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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46d33e5d8abd0ce1ef1eba39a72b19298ed496cc8351420cc2f4a6dc3c12848' 
  AND token = 'DUmy8LVT08ekEkbdGkIMErSpoKneqisPMDk6srBaK8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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