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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c570e19528aebf0c1e43bc3bec177b105ba67230dc408688985ed6191f13a6d' 
  AND token = 'ALUDXWN6zQnhFDXHZiuj4fQgbtvGl4FnIQNWZSsM5Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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