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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6e70cad246c205584dff137a1f376646616056810a3c4ff5bb6c9480ae6c37' 
  AND token = 'qUggM9MauQ44U1rrga4hXERDoz868XBSSYPnryXjIgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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