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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d16bfb594c3f4658ec8dae20b43dac5f9803bca243871c923920aa078b0fe0' 
  AND token = 'xvFJ+TJXqWmtgdoRUXy+ZRvOfXTh74Mpv1eOafbdAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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