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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48717a705ffbd5fb20e6383a26af43dabea17066bd9240fe63ff23454c66ccf' 
  AND token = '0D/2831wBVKU4UvL7tCmepc/oNJRiTlzlJN9bdC6Eqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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