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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca004e43ebdcdb9c9700cdfc5cc3f1238ae489571b78367c4ea36b8ab9383d' 
  AND token = 'x9Jn2QJkSwv+iKZxSg+UW/oY+wTMpdovoPH5IbLe4Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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