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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb4021a554d3788223a8b5c4ea490ded90a400c666d0fc3f4b7a532e076d9b7' 
  AND token = '6xBL0kOefyCO9J5cDzCXkUKj3xWeGfgrJrTdws0Zvxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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