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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f7ad636bcd65d7d0cdf8fa924da4ab858a3cee5ed6e17b37076e497593a9e4' 
  AND token = 'jFiYRaRk3KsgeuWFxGcrnmlbGXsuo/mtVvSX+ZAFU3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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