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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a31f5232a185ac696c56a7363f519b6f7c738749e53658a47fa7fca839e95ff' 
  AND token = 'd38JeKs29bjwZr/iGtqW5F6cMtOQFF6bMzEZaXk36EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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