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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ab6d3db755d5c0eec3724647643e3cf753a6f2df94c284eb0d715c771dce07' 
  AND token = 'MhndTgn0bTba4zv2w4zzjEaLPA0yOCXMoq0QsKTCJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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