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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e95d4f627a957cf900ac10503da9e60bc52b7814a01e7c5024077ec7f9d53d' 
  AND token = 'xpo1W6j1evvpM8DNYj4wlOORrQqB5raOyR/O2wZNzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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