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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c3c1b3f7db7c0fe35adbe9713fd6b23c456ed0fa6f7d8ae8c9c74344c5ade1' 
  AND token = 'x7WOZW4BjJy9FgudUaNvV62dkz+vrHu+pg0T++SeuLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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