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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63f1981337ac25948279708b152d4bc178af50a6177a96d6c4541e97033f4ad' 
  AND token = 'eb9PbBExpcs7zn8nERrzOIVOkSW2ku9bCot0oz0yo7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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