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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a62ea058206baf5e071dfe7001cfc6c269567c0c2ef50eadc7aca45a76585c' 
  AND token = 'NpFBc5DGNPgtoxDVAO+2d3Hs9Mw0ioUksy8AaZMil0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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