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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2583a871c7edab34f5c6095908c4d1cdf38e1bf9f0f4f2128108a7aba77a028a' 
  AND token = 'KUS5ecnuKhGEj8npfIpafLCYlafqm2Rf/iDj0eI4XBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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