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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c08da0d5cd3929d2b41e57ee60ee745a6816020e2f919547858083c1eaa5a82' 
  AND token = 'Lxsf185gmbPGuxtgwqLiuV2CAlor+o7Tt6r56F+D2Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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