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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0cc7576f467884160fe21a5bf0a21b810913fe4dd2fbfb0df9dfb62fb1a9cc' 
  AND token = 'bmtb/KOdCkyKjqKdfe2IUzVkdt7BMq6ShUWMMVNitIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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