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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462a168ae4f52cc1fabb96efd75061cad225f306c60fe123065214ee9ed8bb84' 
  AND token = '75zE+KmZbtWTRfIXxRrrNhN75S5AiafGLBTy/frSLLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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