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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeded2a809c1cf62b76ee0a4b1a217759598c99043e2d73ec001e97a14566ae2' 
  AND token = '8RG8bOgUNoyc4tfPVRW5BEvZHMby3Y7mSZfjnuqWWD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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