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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5101a9b09c23e6b87ea90ac082bd43c4604b363798c43e232d0f072721cc50' 
  AND token = 'WaNJ6Uv1Qs/RLS7AtCb8T87BX6snQBIbESeUY+A7OfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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