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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39305df34871719e2f35fa1b91bb16cda06dc24a21fe672e8ef7c778e38886b3' 
  AND token = 'f26fwu269QyIb945R4Haha+o9gYjsUGqm6srcnQdgwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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