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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ffe2330b84d049fdea6ee6ce37ecdd0ea646ec4ea72798cc198bd84d816fb4' 
  AND token = 'sDp/0NhAjNcokDv+HyaUItTzvVgsW7oAZiOLOuQkOao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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