Candados translates to "padlocks." It's an evocative word that immediately brings to mind images of security and inaccessibility.
In the song, the lyric "tu corazón este con mil candados" (your heart is with a thousand padlocks) uses this word metaphorically to describe a heart that is heavily guarded and difficult to open. This imagery makes the word memorable and highlights the challenge the singer faces in winning over his beloved.
Saul "el Jaguar" Alarcón brings us a song about a man who wishes he could turn back time to be with the woman he loves. He imagines a past where, if he had been there, she "no hubiera sufrido" [would not have suffered]. He's a little dramatic, saying he wouldn't have left her arms bruised, "a lo mucho poquito hinchados tus labios de tantos besos" [at most, your lips a little swollen from so many kisses] he would have given her!
Even though her heart is now locked with "mil candados" [a thousand locks] and her desire to love is "a grabar" [to record], he's not giving up. He's confident he'll win her over, promising that with him, she won't shed "ni una lágrima" [not a single tear]. He acknowledges he might have arrived late, but he's determined to make her happy now that her happiness is "en mis manos" [in my hands].