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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26116d95baa4810d862b203035d78c770ae2a4314aaae162a5140ea9dee11c4' 
  AND token = 'FspsRmGfeXhb2fLjMoyL6NjOzwPXV9wlvSo4In1oYLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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