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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceae4dfbd47d579d05c117f0fe7524f26e685182a47697ad6a66622b75f3f17d' 
  AND token = 'soudkytzL9yK7ivhZ/nkF5j0G2Rcu3zsS+z1dnC91Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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