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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca9bf4a552e75de7e14b59793e7685ee5120d8e4f6cdc6b856ec4f48c5282d5' 
  AND token = '8mESzR01K9ZuH6u4xOxOdg3k/9H/maM0HV5lnvyuKrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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