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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3014f7ddad173e55b00cabdc2cab08df74d16c3de20ab62031488a207b962aca' 
  AND token = 'Xc9prrhZqKK5JrB5Cj2FkmaRCkKFIe2fmLjjiOKhaEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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