I have got an email yesterday: "Your Apple ID has been locked"

No...read: Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support for confirmation/reporting tips.

Apple won't send you an email/text telling you your account is disabled  or will be disabled. You will find out the next time you try to log in somewhere.

Apple will always address you by your name or the name they have on file for you, not Dear Customer, Dear Client or by using your e-mail address.  The e-mail will be from @apple.com or @iTunes.com. E-mail addresses can be spoofed. You can go to Mail/View/Message/Show all Headers to see more. Apple e-mails will never contain an attachment. Apple will never request personal information such as Social Security numbers.

The only exception to the above I have noticed is if you order something from the Apple Store (apple.com), your receipt will be addressed to Dear Apple Customer. That is a receipt for a purchase you initiated.