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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e59c2d6960e76845ec6a1108075ef82ff74a61d731da899387cd600f3a6087e' 
  AND token = 'jrwIvV1KGsOXwJcAYxh4UXnzm3jcba5gfMad31OLySc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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