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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1330b1dc3212ac7797ad09662d3d8db6b9a29c05b2eeafc943467003b116c5ea' 
  AND token = 'lESU/9VrEVbBmS0CVBJ/U+Yx1o/b3QsndC4o3D9NYsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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