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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2d7c34aa5b54610173b70628c0e1d8304aa63dfca004df57645be10efb198e' 
  AND token = 'ZUTttXm/3rZ877uvoY+qNPuEBBX9cvlg46IfTPirk/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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