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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914c3bb8b7cd7cdb29c3083d7530c11e4f0bdbae2735c68c2ef2695bcd15613d' 
  AND token = 'iwVH4GJ7RSyelfecjRYH91d3pLwBdk8rva0objpiU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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