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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821c6011cd20ebe543d6e76a500a22fb56de93818d4c5297ab5d13c8568dbf8d' 
  AND token = 'YjE8bD+/ezI79FbA4KyqjcmMNyvWNFwWdASby6Q7n9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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