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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bbc3233b8966c3f97d533bd9f4bc22234a2323cd735462dc976ecd22548c86' 
  AND token = 'YLErUxlVOQ3YSif0KwK2F49xBuK5CEK4zVGgyyQtJwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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