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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9995724be764174cd33c35d2ac34b714d5340a564bec8247511781f665b2d657' 
  AND token = 'djIIPvBlIseGNuN51QXdeaCe1nLM9O+3UFRRHRbDpOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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