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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03070a1d5b16ce6939f160cf8e1565265a6d50d917ca343ef04564afeb17f9a' 
  AND token = 'U+y8V00x69Q25Y+ew57KubUa0SMl6sW3nHGmln2y6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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