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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c517b0f3c8da744b7db8a8439d5337433f4f800681ff394b2763026be4eaf84c' 
  AND token = 'HICG2uZF6LQdfB3HSWn/QoMBvBWvpYfqOLMGSmEA94Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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