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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10ce4fe1dd0eb7c889fa0d63e50fa9c67c6f3f8afd9940ce29e0b8e353d9bd1' 
  AND token = 'fgsMvV6/XOQb7s5JsXTa1kLxoCkDNHlWME7sDX8bukA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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