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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d917b0009d65c7c40331391aa8e24134ba2aa1ac401618dc7bab28b600b0c6f' 
  AND token = 'KrYM+f+PKMvFlcfV5Lyk9QJK000Kyy35tPB+7uo0peA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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