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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7ea56546b7f73153bdf68477c90207772698989d50f9e70f95588bbb2920ca' 
  AND token = 'DoAblWE4IjdXhXEn3pZUgF0k18L6Ttz09QJ+/BOUd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}