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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31eb4a14f58926ddf84907c98f4fb4449d65057258233b8423b40bc3814cb76b' 
  AND token = '7mrJoz6y0OCZJmZjTKpTH8JDlXCasFiNj9Ioj9/rvj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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