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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce8e3d71976e9f9dc75acc1ce9f57f4a12b6eba6ee71c9bff35be9d58576931' 
  AND token = 'aoH0eefAZEhgrodPQrdTaPMz5RLUX3lkLmTPYi+LYTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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