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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e842a084c0d715765954a54cc261d53c86d6e49ec39fef47e1cc19d148239265' 
  AND token = 'bTjulbb75JjcchAEkDml71Vtl3J1WB5QybQ4MV/yssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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