Hi Adrian,
Open site explorer generally isn't the most reliable source for checking a sites indexing as you are are checking against their ( moz ) crawl index. There is no relevance if Moz has crawled your website or not, likewise if you are checking your backlink status Moz generally doesnt pick up all of your backlinks nor is is updated regular enough in my opinion.
You would be better of checking with ahref's and/or Majestic for backlinks, however index status you can check via Google Search console, or by simply googling the URL you wish to check. Via search console you can also "fetch as google bot" and request indexing if its not currently indexed.
If you feel there is possibly an indexing problem with your site, feel free to tell us the URL and ill be happy to have a quick look for you.