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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58caf8f9e0bd5441f6de4ee5c8a98702f1432ea9f187435418b5aa93e4878d34' 
  AND token = '5gd7je671VKb0ZVlt7VlGw7jtaynpbLtS9nRt6vsu6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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