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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da082091c64bfcab096f77470798e9ae665a35cfa8d03d7b3c10feaf8e4365a7' 
  AND token = 'PKID3ui5IZwcE3LXmKIum0q07H58kt9LgO/sAqKRyE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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